I would strongly suggest contacting your local beekeeping society, they have lots of good advice. Or even ask your nucleus supplier about how many brood boxes you need. If you need two, that Flow super should not be on the hive yet. Just a thought. You probably need to do a lot of reading too. You can’t neglect bees in El Paso, you have varroa, small hive beetles and africanization to deal with, requiring conscientious inspections. Good luck!